| Acronym | Meaning |
 | NHO | N?ringslivets Hovedorganisasjon (Confederation Of Norwegian Enterprises |
| NHRA | National Hot Rod Association |
| NHS | National Health Service (UK) |
| NI | Nicaragua (ISO 3166 Digram) - Nigeria (FIPS 10-4 Country Code) |
| NI | Nickel |
| NIAAA | U.S. National Institute On Alcohol Abuse And Alcoholism |
| NIAID | National Institute Of Allergies And Infectious Disease |
| NIAMD | National Institute Of Arthritis And Musculoskeletal Diseases |
| NIB | New In Box (Internet Auction/trading Listings) |
| NIC | Network Interface Card -Nicaragua (ISO 3166 Trigram) |
| NICAP | National Investigations Committee On Aerial Phenomena |
| NICE | UK. National Institute For Health And Clinical Excellence |
| NICHD | National Institute Of Child Health And Human Development [4] |
| NICP | National Inventory Control Point |
| NIDDK | National Institute Of Diabetes And Digestive And Kidney Diseases |
| NIDRR | National Institute On Disability Research And Rehabilitation |
| NIEHS | National Institute Of Environmental Health Sciences |
| NIH | National Institutes Of Health - Not Invented Here |
| NIIN | National Item Identification Number |
| NIMA | National Imagery And Mapping Agency (became NGA) |
| NIMBY | Not In My Back Yard |
| NIMH | National Institute Of Medical Herbalists - National Institute Of Mental Health |
| NIMH | Nickel Metal Hydride (Ni Is The Chemical Symbol For Nickel) |
| NIN | Nine Inch Nails (band) |
| NIO | Nicaraguayan Cordoba Oro (ISO 4217 Currency Code) |
| NIPR | National Institute Of Polar Research (Japan) |
| NISAC | U.S. National Infrastructure Simulation And Analysis Center |
| NISCAP | NSA Information System Certification And Accreditation Program |
| NISER | National Institute Of Science Education And Research |
| NIST | National Institute Of Standards And Technology |
| NITFS | National Imagery Transmission Format Standard |
| NIU | Niue (ISO 3166 Trigram) |
| NJ | Nanojoule |
| NJ | New Jersey (postal Symbol) |
| NK | Nanokelvin |
| NKA | No Known Allergies |
| NKVD | Narodnyi Komissariat Vnutrennikh Del (Russian People's Commissariat Of Internal Affairs) (1934-1954) |
| NL | Dutch Language (ISO 639-1 Code) |
| NL | Nanolitre |
| NL | Netherlands (ISO 3166 And FIPS 10-4 Country Code Digram) - Newfoundland And Labrador (postal Symbol) |
| NLB | Non-Linear Battlefield |
| NLD | Dutch Language (ISO 639-2 Code) |
| NLD | Netherlands (ISO 3166 Trigram) |
| NLL | National Lacrosse League |
| NLOS | LS -Non Line Of Sight-Launch System |
| NLP | Natural Language Processing - Neuro-Linguistic Programming (pseudoscience) |
| NLW | Non-Lethal Weapon |
| NM | Nanometre |
| NM | New Mexico (postal Symbol) |
| NMCI | Navy Marine Corps Intranet |
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